Method of electric welding.



No. 728,023. 7 PATENTED MAY 12, 1903. J. SGHUREK 6v F. B. GIESLBR.METHOD OF ELEGTRIG WELDING;

APPLIOATIOI FILED MAR. 31. 1900. RENEWED SEPT. 19, 1902.

.10 IODEL.

"UNITED STATES Patented May 12, 1903.

PATENT OFFI E.

METHOD OF ELECTRIC WELDING.

SPECIFICATION forming part of Letters Patent No. 728,023, dated May 12,1903.

Application filed March 31, 1900. Renewed September 19. 1902. $erial No.124,081. (No specimens.)

To all whom, it may concern.-

Be it known that we, JOSEPH SCHUREK and FRANKLIN B. GIESLER, citizens ofthe United States, and residents of Milwaukee, in the county ofMilwaukee and State of Wisconsin, have invented certain new and usefulImprovements in the Methods of Electric Weiding; and we do herebydeclare that the followingis a full, clear, and exact descriptionthereof.

Our invention has especial reference to the welding together of articlespresenting different areas of surface at different weldingpoints; and itconsists in a novel method of accomplishing this result, as will befully set forth hereinafter with reference to the accompanying drawingsand subsequently claimed.

In the said drawings, Figure 1 is a diagram illustrating the operationof our said invention. Fig. 2 is an end elevation of one of the parts ofthe article shown in Fig. 1 before welding, showing also a broken Viewof a nonconducting plate employed in said operation. Fig. 8 is adiagramsimilar to Fig. 1, but showing (in section) the two parts of anotherarticle to be similarly welded. Fig. 4 is a perspective and partlybroken View of the article shown in Fig. 3 with a detached View of thenon-conducting plate employed.

Referring to the drawings, A 13 represent the two parts of a steel linkready to be welded together, the side members of said link being ofunequal size, the relative areas of the welding-points of said partsbeing best illustrated (with respect to the part B) at b and b in Fig.2, and the corresponding welding-points a a, of the part A being ofprecisely the same relative areas.

C represents a thin plate of any suitable non conducting material, suchas glass or gutta-percha.

D E indicate the electrodes, the same consisting in this instance of apair of presserblocks, which are preferably shaped on their opposedsurfaces to conform to the shape of the adjacent portions of the partsof the ar ticle to be welded and which are arranged so that they may besimultaneously forced toward each other or separated, the specificconstruction of the machine of which these presser-blocks constitute apart forming, how ever, no part of this present invention, it beingunderstood that said presser-blocks have the capability of movement justdescribed and are properly connected, as by the wires 02 e, to a sourceof electric current, (not shown,) so as to form the electrodes orterminals of an electric circuit.

The foregoing description applies equally to the illustration of ourinvention in connection with the welding of the two parts of the slottedmetallic cylinder shown in Figs. 3 and 4, wherein we have marked saidtwo parts A B, but otherwise employed the same reference-letters for theparts corresponding to those shown in Figs. 1 and 2.

In carrying our invention into practice, and referring now to Figs. 1and 2, the two parts A and B of the link to be welded are supportedbetween the electrodes or presserblocks D E, with the described thinnonconducting plate 0 interposed between the welding-points a b of leastarea of contact of the said two parts, and then the current is turnedon, the said presser-blocks D E being forced toward each other and thispressure maintained until the said two parts A B of the link, are weldedtogether at the contactingfpoints a b, and then the pressure of theblocks D E is momentarily released (without the necessity of shuttingoff the current) and the plate 0 withdrawn,when the pressure of theblocks D E is instantly restored to bring the welding-points a b of thelink into contact, when the current will immediately weld the parts thusbrought into contact.

Precisely the same operation would be carried out in welding togetherthe two parts of theslotted metallic cylinder shown in Figs. 3 and 4,where the contacting surfaces at b of the parts A B are to be understoodas extending throughout the entire length of said parts, while thecontacting surfaces marked a b are relatively very short or ofcomparatively small area.

Without the use of an interposed body of non conducting material at theweldingpoints a b it would be impossible to successfully perform theoperation of electric welding with an article presenting extremedifferences in the areas of surface at difierent welding-points,for thereason that the electric current would burn or fuse away the metal atthe welding-points of smaller areas before the welding could beaccomplished between the contacting surfaces offgreater' areas; but bycarrying out our present invention the welding of "articles of thisnature can be quickly and successfully accomplished.

Having thus described our invention, what we claim as new, and desire tosecure by Let.- ters Patent, isi 1. The method of welding togetherpieces of metal which present diiferent areas of surface at differentWelding-points, consisting in bringing and holding said pieces togetherbetween a pair of electrodes, and with the larger welding-points incontact and the smaller Welding-points kept out cf contact; sending anelectric current through said pieces of metal untilthey are weldedtogether at said larger welding-points, and then bringing the smallerwelding-points of said pieces of metal into contact and holding themtogether until the said pieces of metal are' welded'together at saidsmaller welding-points.

2. The method of welding together pieces of metal which presentdifierent areas of surface at diiferent welding-pointsfconsisting ininserting a body of non-conducting material between the; smallerwelding-points and then holding the said pieces of metal together, underpressure, between a pair of electrodes and with the largerwelding-points in contact; maintaining the pressure and sending anelectric current through said pieces of metal until they are weldedtogether at said larger welding-points; momentarily releasing thepressure, and withdrawing said non-conducting body from between the saidsmaller.

